144 CALIFORNIA ACADEMY OF SCIENCES. 
cells. The septa posterior to somite xiv again are not much cupped, but each one is 
lined on each side by a single layer of very thick tall peritoneal cells (fig. 153). 
Alimentary canal. Pharynz is furnished with a large upper chamber and is 
apparently only developed superiorly, although it possesses a small subpharyngeal 
gland close to the ventral nerve cord. 
(Hsophagus rises diagonally upwards and joins the single gizzard situated in 
v. The tubular-intestine extends to xiy. The sacculated-intestine commences in xv. 
There is a typhlosole in the dorsal wall of the intestine in xvi to xix. The typhlo- 
sole presents a network of fibres resembling in a general way the structure of a 
sponge. This typhlosole does, however, not descend into the canal, but partakes 
more of the nature of a wide continuous blood-sinus. 
Salivary glands. The suprapharyngeal glands form a mass with five distinet 
lobes, of which the posterior one, as usual, is the largest and the anterior one the 
smallest (fig. 149). There is also a subpharyngeal gland very low but rather long 
(fig. 149). A thin but wide septal gland is found in vi, posterior to the gizzard, 
while smaller septal glands, which are principally developed ventrally are found in 
vu and yi. 
Spermathece consist of two pairs of long and narrow organs in vili and ix 
opening in the intersegmental grooves between vi and yiii and viii and ix. In my 
specimens they were probably rather undeveloped and did not show any trace of 
diverticula either externally or in the wall. 
Testes are in x and xi and ovaries in xiii. The oviduct opens between the 
setee and septum. Spermiducal funnels or rosettes are very small, thick and compact, 
and situated in x and xi. The spermducts run separately backwards between the 
longitudinal layer and peritoneum and open jointly on the center of xviii as usual. 
Prostates are in four pairs as has been already stated, two and two opening in 
each pore in line with sete 1 and 2, these sets, however, not being present in these 
somites (fig. 150). The prostates showed no glandular part, the whole being muscu- 
lar (fig. 154). They were very thin, tubular, the two prostates in each twin couple 
running entirely parallel and close together along the septa, as far as the line of sete 
Sand 4, A large part of this distance the muscular part is surrounded by regular 
peritoneal cells, not by the large glandular ones. Each prostate remains separate 
from the other and even their external pores, though situated close to each other, are 
not strictly joined, though they are surrounded by a common thicker lip (figs. 150 
and 151). I have already referred to the duplication of prostates in one species of 
Kerria, otherwise it has not been found with certainty in Acanthodrilidee. Some of the 
earliest described Acanthodrilides were, however, supposed to have a prostate and 
spermducts open jointly, and it does not seem unreasonable to suppose that in some 
case at least a duplicate prostate existed, and one was mistaken‘for a spermduct. This 
would be quite easily done in specimens poorly preserved, especially if the prostates 
should be entirely muscular as in Acanthodrilus Vasliti, in which species they are 
also very narrow and thin and not really wider than the spermducts of many forms. 
Ude, in describing Geodrilus singularis from Danyille, Illinois, mentions as one of the 
